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研究报告

Synthesis of BiPO₄/α-Fe₂O₃ and its photocatalytic degradation of gaseous styrene

摘要：利用水热法合成了BiPO₄/赤铁矿复合催化剂，并对催化剂进行了X射线衍射（XRD）、扫描电镜（SEM）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、紫外可见漫反射（DRS）、BET比表面及光致发光光谱（PL）等一系列表征，同时探讨了不同制备条件下的复合催化剂对气态苯乙烯降解的影响及其光催化机理.结果表明：天然赤铁矿的负载能有效提高BiPO₄光生电子-空穴对的分离效率，提升其光催化活性；当制备BiPO₄/赤铁矿的条件为质量比1∶1、溶液pH=1、焙烧温度300 ℃时，复合材料对50 mg·m^-3气态苯乙烯的降解率最高，达到87.9%，且在同等条件下进行4次循环实验后，降解率仅下降5.9%，稳定性得以证明.经过机理实验研究证明，BiPO₄/赤铁矿复合催化剂光催化降解苯乙烯主要是光生电子-空穴对、氧衍生的超氧自由基及羟基自由基起主导作用.

Abstract：BiPO₄/α-Fe₂O₃ hybrid photocatalysts was synthesized by hydrothermally method and characterized by means of X-ray diffraction （XRD）， scanning electron microscope （SEM）， X-ray photoelectron spectroscopy （XPS）， transmission electron microscope （TEM）， UV-VIS reflection spectrometer （DRS）， N₂ adsorption-desorption measurement （BET） and photoluminescence spectroscopy （PL）. The styrene degradation efficacy of hybrid catalysts prepared under different conditions and their photocatalytic mechanism were discussed. The results showed that the loading of natural hematite could effectively improve the separation efficiency of BiPO₄ photoelectron-hole pair and enhance its photocatalytic activity， when the mass ratio of BiPO₄ and α-Fe₂O₃precursors was 1∶1，initial solution pH value was 1 and calcination temperature was 300 ℃， its degradation rate with 50 mg·m^-3 styrene was 87.9%. The degradation rate only decreased 5.9% after 4 cyclic experiments under the same conditions， confirming its superior stability. Photocatalytic degradation of styrene by hybrid catalysts was mainly caused by photoelectron-hole， oxygen-derived superoxide radical and hydroxyl radical.